MITIGATING A PHASE ANOMALY IN AN ANALOGUE-TO-DIGITAL CONVERTER OUTPUT SIGNAL

摘要

A method and apparatus for mitigating a phase anomaly in an analogue-to-digital converter (ADC) output signal is disclosed. A plurality of codewords output by the ADC are received and information about an estimated level of interference between an output of the ADC and an input of the ADC due to the codeword is obtained for each codeword based on the logic values of bits in the codeword. In-phase (I) and quadrature (Q) corrections are obtained based on the information about the estimated level of interference, and applied to I and Q values obtained from the ADC output signal. The information about the estimated level of interference can be obtained based on the Hamming weight of the codeword, a weighted digit sum of the codeword, and the numbers of 0 to 1 and 1 to 0 transitions between the current codeword and the preceding codeword. In an embodiment, the information about the estimated level of interference can be a sequence of values defining an estimated interfering signal, and scaling and rotating the estimated interfering signal according to predetermined amplitude scaling and phase rotation parameters.